From: Jiang Liu Date: Fri, 30 Mar 2012 15:11:33 +0000 (+0800) Subject: genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return value X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=f5cb92ac82d06cb583c1f66666314c5c0a4d7913;p=openwrt%2Fstaging%2Fblogic.git genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return value irq_move_masked_irq() checks the return code of chip->irq_set_affinity() only for 0, but IRQ_SET_MASK_OK_NOCOPY is also a valid return code, which is there to avoid a redundant copy of the cpumask. But in case of IRQ_SET_MASK_OK_NOCOPY we not only avoid the redundant copy, we also fail to adjust the thread affinity of an eventually threaded interrupt handler. Handle IRQ_SET_MASK_OK (==0) and IRQ_SET_MASK_OK_NOCOPY(==1) return values correctly by checking the valid return values seperately. Signed-off-by: Jiang Liu Cc: Jiang Liu Cc: Keping Chen Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1333120296-13563-2-git-send-email-jiang.liu@huawei.com Signed-off-by: Thomas Gleixner --- diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c index 47420908fba0..c3c89751b327 100644 --- a/kernel/irq/migration.c +++ b/kernel/irq/migration.c @@ -43,12 +43,16 @@ void irq_move_masked_irq(struct irq_data *idata) * masking the irqs. */ if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask) - < nr_cpu_ids)) - if (!chip->irq_set_affinity(&desc->irq_data, - desc->pending_mask, false)) { + < nr_cpu_ids)) { + int ret = chip->irq_set_affinity(&desc->irq_data, + desc->pending_mask, false); + switch (ret) { + case IRQ_SET_MASK_OK: cpumask_copy(desc->irq_data.affinity, desc->pending_mask); + case IRQ_SET_MASK_OK_NOCOPY: irq_set_thread_affinity(desc); } + } cpumask_clear(desc->pending_mask); }